package com.mycjj.android.database;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.os.Environment;

public class DBOpenHelper extends SQLiteOpenHelper {


	private static String DB_PATH = Environment.getDataDirectory()+"/data/com.truekey.project/databases/";
	
	private static String DB_NAME = "sonydb.sqlite";
	private SQLiteDatabase myDataBase;
	private final Context myContext;
	
	private CacheJsonDao cacheJsonDao;
	
	private static String OCR_FILENAME = "eng.traineddata";
		
	/**
	 * Constructor Takes and keeps a reference of the passed context in order to
	 * access to the application assets and resources.
	 * 
	 * @param context
	 */
	public DBOpenHelper(Context context) {
		super(context, DB_NAME, null, 1);
		this.myContext = context;
	}

	/**
	 * Creates a empty database on the system and rewrites it with your own
	 * database.
	 * */
	public void createDataBase() throws IOException {
		boolean dbExist = checkDataBase();
		if (dbExist) {
			// do nothing - database already exist
		} else {
			// By calling this method and empty database will be created into
			// the default system path
			// of your application so we are gonna be able to overwrite that

			this.getWritableDatabase();
			try {				
				copyDataBase();
				this.close();
//				copyTessdata();

				
			} catch (IOException e) {
				throw new Error("Error copying database");
			}
		}

	}
	
	public String  getVersion(Context context) {
		String version = null;
	      try {
	          PackageManager manager = context.getPackageManager();
	          PackageInfo info = manager.getPackageInfo(context.getPackageName(), 0);
	          version = info.versionName;
	     } catch (Exception e) {
	         e.printStackTrace();
	     }
	      return version;
	}

	/**
	 * Check if the database already exist to avoid re-copying the file each
	 * time you open the application.
	 * 
	 * @return true if it exists, false if it doesn't
	 */
	private boolean checkDataBase() {
		SQLiteDatabase checkDB = null;
		try {
			String myPath = DB_PATH + DB_NAME;
			checkDB = SQLiteDatabase.openDatabase(myPath, null,
					SQLiteDatabase.OPEN_READWRITE);

		} catch (SQLiteException e) {
			// database does't exist yet.
		}
		if (checkDB != null) {
			checkDB.close();
		}

		return checkDB != null ? true : false;
	}

	/**
	 * Copies your database from your local assets-folder to the just created
	 * empty database in the system folder, from where it can be accessed and
	 * handled. This is done by transfering bytestream.
	 * */
	private void copyDataBase() throws IOException {
		// Open your local db as the input stream
		InputStream myInput = myContext.getAssets().open(DB_NAME);
		// Path to the just created empty db
		String outFileName = DB_PATH + DB_NAME;
		// Open the empty db as the output stream
		OutputStream myOutput = new FileOutputStream(outFileName);
		// transfer bytes from the inputfile to the outputfile
		byte[] buffer = new byte[1024];
		int length;
		while ((length = myInput.read(buffer)) > 0) {
			myOutput.write(buffer, 0, length);
		}
		// Close the streams
		myOutput.flush();
		myOutput.close();
		myInput.close();
	}
	
	/**
	 * 
	 * @param name  
	 * @param filepath
	 * @throws IOException
	 */
	public void copyArFileformAssets(String name,String filepath) throws IOException {
		InputStream myInput = myContext.getAssets().open(name);
		
		String outFileName = filepath + name;
		File file = new File(outFileName);
		
		if(!file.getParentFile().exists()){
			file.getParentFile().mkdirs();
		}		
		// Open the empty db as the output stream
		OutputStream myOutput = new FileOutputStream(outFileName);
		// transfer bytes from the inputfile to the outputfile
		byte[] buffer = new byte[1024];
		int length;
		while ((length = myInput.read(buffer)) > 0) {
			myOutput.write(buffer, 0, length);
		}
		// Close the streams
		myOutput.flush();
		myOutput.close();
		myInput.close();
		
	}
	//拷贝 ocr 库
	private void copyTessdata() throws IOException{
		InputStream myInput = myContext.getAssets().open(OCR_FILENAME);
		
		String outFileName = myContext.getFilesDir().toString()+"/tessdata";		
		File file = new File(outFileName);
		if(!file.exists()){    
          if(!file.mkdirs())
        	  return;
		}		
		outFileName+="/"+OCR_FILENAME;
		
		OutputStream myOutput = new FileOutputStream(outFileName);
		
		byte[] buffer = new byte[1024];
		int length;
		while ((length = myInput.read(buffer)) > 0) {
			myOutput.write(buffer, 0, length);
		}
		
		myOutput.flush();
		myOutput.close();
		myInput.close();
	}

	@Override
	public synchronized void close() {
		if (myDataBase != null)
			myDataBase.close();
		super.close();
	}

	@Override
	public void onCreate(SQLiteDatabase db) {

	}

	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

	}

	// Add your public helper methods to access and get content from the
	// database.
	// You could return cursors by doing "return myDataBase.query(....)" so it'd
	// be easy
	// to you to create adapters for your views.

}
